ixgbe: Remove unnecessary #ifdef CONFIG_DEBUG_FS tests

Add some empty static inlines instead to make
the code more readable.

Signed-off-by: Joe Perches <joe@perches.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
index a8e10cf..ca93238 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
@@ -740,6 +740,11 @@
 extern void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter);
 extern void ixgbe_dbg_init(void);
 extern void ixgbe_dbg_exit(void);
+#else
+static inline void ixgbe_dbg_adapter_init(struct ixgbe_adapter *adapter) {}
+static inline void ixgbe_dbg_adapter_exit(struct ixgbe_adapter *adapter) {}
+static inline void ixgbe_dbg_init(void) {}
+static inline void ixgbe_dbg_exit(void) {}
 #endif /* CONFIG_DEBUG_FS */
 static inline struct netdev_queue *txring_txq(const struct ixgbe_ring *ring)
 {